Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1571532057c0bf8…

MALICIOUS

PDF

67.5 KB Created: 2021-02-18 11:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: aefe7f6864d7f541ba7184f1c657678d SHA-1: 55b2b69b5874f17f30c5e8ba2fdfa383c9ce73da SHA-256: b1571532057c0bf8629667fe576dce7877501613088af4c75de45be7cbab9e74
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, indicating it functions as a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this purpose. The ML classifier and ClamAV detection confirm its malicious nature, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=norstar+phone+manual PDF link annotation
    • https://puluwasazos.weebly.com/uploads/1/3/1/6/131606552/nunoberen.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/nji71he/79952191057.pdfIn PDF document text
    • https://cdn.sqhk.co/digubamot/jjJjahh/2110009219.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/454217b0.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ijidrii/dreamer_horse_movie_true_story.pdfIn PDF document text
    • https://cdn.sqhk.co/donaxewon/jbiajj4/piano_tap_tiles_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/asiaZgh/steven_universe_ski_adventures_in_light.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedaxesipuwid.epizy.com/13426132526.pdfIn PDF document text
    • http://gabakadosaris.epizy.com/challenging_math_riddles_with_answers.pdfIn PDF document text
    • http://pagikojezokatu.rf.gd/excel_index_match_two_sheets.pdfIn PDF document text
    • http://kupikobu.epizy.com/shin_chan_video_tamil_movie.pdfIn PDF document text
    • http://vopezaxaf.epizy.com/69176956012.pdfIn PDF document text
    • http://radoletoma.epizy.com/fade_into_darkness_piano_sheet_music.pdfIn PDF document text
    • http://kumobeba.epizy.com/lavadora_brastemp_11kg_bwk11_manual.pdfIn PDF document text
    • http://ruraduwajisiv.rf.gd/1986_yamaha_moto_4_specs.pdfIn PDF document text
    • http://fevumuweli.rf.gd/74942631572.pdfIn PDF document text
    • http://xugivazule.rf.gd/proper_squat_form_bodyweight.pdfIn PDF document text
    • http://sevuvev.epizy.com/free_acoustic_guitar_sheet_music.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 5028 bytes
SHA-256: 659b0db679f9bf81e4fe8f2405bf996360edbbf36c69c170533c9acfff84b4f4
font_01_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 10956 bytes
SHA-256: 046004c25d669f467ced262a3b3993c41da74257e26d146063d235126f48d34e

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